Excavating tooth



April 8, 1930. L. w. VAN BUSKIRK 1,753,392

' EXCAVATING TOOTH Y J I! m Patented Apr. 8, 930

I'I-'-NITED* s'r-A'rss PATENT OFFICE LESHER W.,VAN BUSKIRK, OE EASTON,PENNSYLVANIA EXCAVATING 'roo'rn iApplication filed July 2,

The present invention. relates to the teeth of excavating or diggingdippers, and aims to provide an excavating toot comprising a base andremovable tip assembled in a novel manner to resist stresses and strainsand to o engaging and'interfittin'g portions and with "provlsi'on forattaching the base and tip together, so as to rigidlyan'd firmly: holdthe tip in place on the base; p

A further object is-to providea tip ofsuch form that will; actualdigging present a sharp cutting surface and at the same time .lift. anddeflect the .dug or loosened material away from the forward end of thebase so as to increase the lifeof the base.

' With the fore oin-g and other objects in L view, which will e apparentas the descrip- I tion proceeds, theinvention resides m the 1construction and arrangement of parts,'as"

hereinafter describedand claimed, it being understood that changes canbe made within the scope of what is claimed, without. departing from thespirit of the invention.

The invention is illustrated in the mom-.

panying drawing, whereinz Figure 1 is a side elevat'on of the improvedtooth, the rear 7 broken away. y 'Fig. 2 is a plan view of the tooth.

3-3 of Fig. 2.

Fig.4 is a perspective. view of the base of the tooth.

. The tooth comprises the base 7 and tip 8 composedof suitable metal,and the base is secured 'in the usual manner to the bottom of the dipper(not shown).- w

The tip 8 is V=shaped in side levation, and

has the rearwardly diverging wings 9 which.

extend to the upper and lower surfaces 10 and 1 1, respectively, of thebase 7. The wings 9. fit astride the nose 12 of the base 7 which andlower seating surfaces 13 against which terminal of the base being,

1927. Serial No. 203,125.

the wings 9 of the tip bear, and the base has the shoulders 14 at therear ends'of the surfaces 13 against which the rear ends of the win-gs 9contact, so that the surfaces 13 and r.

shoulders 14 take up the stresses and strains from the tip 8 undercompression. The forward end portion of the base 7 is bifurcated,

being provided with a slot 16 between the opposite sides of the base andextending from the nose 12 rearwardly and upwardly so as tosubstantially bi'sect the angle between the surfaces 13. The bifurcationof teeth bases heretofore used has been'a source of annoyance, due tothe weakening of the bases, re-

sulting in breakage. In order to overcome the shoulders 14 and fiushwiththe surfaces 13, so that the wings'9 seat against the webs 17. The webs17- thus uni-tethe opposite side portions or wings of the 'nose of thebase,

making the nose portion of the base stronger.

at its point of greatest stress and resisting the tendency for the sideportions of the base nose to separate or break off sidewise.

- The inner const'ruetion'of the tip has a web 15 in the angle betweenand connecting the wings 9L- and extended rearwardly to provide ashankor stem. Said shank is of I cross section to provide for maximumstrength with'minimuin cross-scetionalarea, with the shank thickest atits upper and lower edges Fig, .15 agi di l ti 9n th line; where thestrength is, most needed. The

shank 15 extends rearwardly within the slot 16 between the'webs 17,thereby providing a strong construction, and the shank fitting in v theslot 16 with the wings 9- bearing against -the sides of the slot 16, andit will be noted that these flanges or contacting portions terminateshort of or are spaced from the juncture of the wings 9. Therefore,'theshank only contacts with the base at points spaced from the nose oft-hebase,thereby decreasing the bending strain on the nose portion of thebase due to side pressureon the tip.

In the outer construction of the tip on which comes the wear due todigging, the'tip is V-shaped in side elevation starting from the apex toa point adjacent to or slightly rearwardly beyond the tip of the nose 12of the base, to provide the fiat upper and lower surfaces 20. From therear ends of the surfaces extend the surfaces 21 to the ends of thewings 9, and the surfaces 21 are at a greater angle to the bisector ofthe angle of the tip than are the surfaces 20. The surfaces 20 and 21are arranged at obtuseangles relati'vel to one another, and the anglebetween t e surfaces 21 is substantially the same as the angle betweenthe surfaces 13 or the inner surfaces of the wings 9, and is greaterthan the angle between the surfaces 20. As a result the surfaces 21 arearranged at-angles with the surfaces 10 and 11 of the base greater than180 degrees, so that said surfaces are not flush, and the surfaces 21,

' in the actual digging action, will deflect the vmaterial away from thesurfaces 10 and 11, so as to increase the life of the base, and preventthe gouging out of the surfaces'lO and 11. The shoulders 14arerelatively deep and the rear ends of the wings 9 are relatively encyforthe tip to rotate around the securing element, such as when thesecuring ele- -ment is located further forward'or between the wings ofthe tip.

The webs 17 are located in rear of the open portion of the slot 16, sothat the seating or earing surfaces 13 of the nose extend completelyacross the width of the base, and the rear portions of the wings 9 thusseat on the surface 13 for the full width of the base and tip. Not onlydo the wings 9 bear. against the surfaces 13, but the shank 15= bearingagainst the upper and lower walls of the slot 16 will enable the-toothto resist the stresses due to the excavating or digging action.

ing wings and a rearwardly extending shank between the wings of I-shapedcross section with the flanges at the. opposite sides of the shank tocontact with'the sides of a slot in a tooth base, said flangesterminating short of the juncture of said wings.

- 3. An excavating tooth comprising a base having a nose, upper andlower surfaces in rear of the nose, relatively deep shoulders betweensaid nose and surfaces, and a slot in the nose and entering the basebeyond said shoulders, and a tip having diverging wings fitted over saidnose, the rear ends of the wings being relatively thick and abuttingsaid shoulders, the outer surfaces of the wings being at an obtuse anglewith the surfaces of the tip, said base and wing surfaces convergingtogether to said shoulders voutwardly beyond the planes of said. tipsur-. faces so that the tooth is of increased thickness at saidshoulders, the tip having a shank between and projecting beyond saldwings and entering said slot. I

In testimony whereof I hereunto aflix my signature.

LEsHER w. VAN BUSKIRK.

Havingthus described the invention, what v is claimed as new is.: v 5 1.An excavating tooth tip having divergmg wings and a rearwardly extendingshank between the wings provided with contact-- ingportions at itsopposite sides to contact with the sides of a slot in a tooth base, saidcontacting portions terminating short of the juncture of said wings.

2. An excavating tooth tip having diverg-

